Format titleCell with locale

[hensansi]

I encountered the same issue as ant-design/ant-design#31339

Alternative solution to #273

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[hensansi]

Regarding the coverage, it is a breaking change due to the current locales,
https://github.com/react-component/picker/blob/master/src/locale/en_US.ts#L19

I will look into why rc-picker-cell-end disappears

[hensansi]

I only used koKR to keep some continuation with the previous implementation 'YYYY-MM-DD'

[codecov]

Codecov Report

Merging #312 (a71f9f9) into master (13e10ec) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head a71f9f9 differs from pull request most recent head b7dc951. Consider uploading reports for the commit b7dc951 to get more accurate results

@@            Coverage Diff             @@
##           master     #312      +/-   ##
==========================================
- Coverage   99.52%   99.52%   -0.01%     
==========================================
  Files          45       45              
  Lines        2118     2117       -1     
  Branches      627      627              
==========================================
- Hits         2108     2107       -1     
  Misses          8        8              
  Partials        2        2              

Impacted Files	Coverage Δ
src/panels/DatePanel/DateBody.tsx	96.00% <100.00%> (ø)
src/panels/PanelBody.tsx	100.00% <100.00%> (ø)
src/utils/timeUtil.ts	100.00% <100.00%> (ø)

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[hensansi]

I think that this behavior wise is a breaking change, so it needs to be handled/notified carefully although at the same time it will give a better experience to the user.

[hensansi]

I just noticed that there are harcoded defaults in other places/not using the locale (enGB) e.g.

RangePicker

picker/src/utils/uiUtil.ts

Line 147 in 8bc4cce

export function getDefaultFormat<DateType>(

I can try to understand how we can use the locales for that too, I assumed that the code was using a default locale but that's not the case. Can you give me some hint on why it was structured this way/can I bring some suggestion to the table regarding this?